Improved rock-drill



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RICHARD CM. LovnLL, or COVINGTON, KENTUCKY. Lette/rs Patent No. 86,988, dated Febm/ry 16, 1869.

IMPROVE!) ROCK-DRILL.

The Schedule referred to in these Letters Patent and making part: of the same.

To all whom it 'may conce/rn:

. Be it known that I, RICHARD G. M. LovELL, of Covington, Kenton county, Kentucky, haveinvented a certain new and useful Improvement in Rock and Coal- Drills; and do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part of this specification.

This invention relates-to thatclass of mechanical appliances,` which are employed in various kinds of drilling-operations for mining-purposes; and

My improvement consists in automatically rotating the chisel, before each and every blow, by means of a .swinging or vibrating pendant, and a worm and wormwheel, which are attached to a'fr'ame that carries the chisel, said` operating-pendant being actuated by the momentum of the piston-rod, frame, chisel, and their accompanying devices, which devices will be hereafter fully described.

In the accompanying drawings- Figure l is a perspective view of a drillembodying my improvements, and -r Figure 2 is a longitudinal section of 'the apparatus, with the different parts detached.

Figure 3 i's a side elevation of the operating-pendant and its accompanying ratchet.` A

A represents the cylinder `of an engine, which may be operated by steam, compressed air, o r other suitablepower; and this cylinder is provided with a pistonrod,-B, which carries a frame, C.

lhe frame C .has a stem, c, which is adapted to enter a socket, b, in the outer end of the piston-rod; and these two members are connected by the removable key D.l

J ournalled in the frame G is a shaft, E, to one en of which is connected, the swinging pendant F, whose vibration is limited, in either direction, by the stops f f'.

The shaft E also carries two ratchet-wheels, e e, and a worm, G, the latter of whichvgears with a wormwheel, H, having \an axial perforation, h, for the reception of the shank t' of the chisel I.

In order to relieve the worm-wheel H from the shock caused b'y the chisel striking the rock, I provide the inner endof'the chisel with a shortstem, i', that is seatedin the socket J of' the frame.

The chisel is united t the worm-wheel by a key, K.

L is a pawl upon the pendant F, for the purpose of operating the ratchetewh'eel e, and a similar pawl, L', upon the frame, prevents the worm G being rotated in the wrong direction.

The operation of my coal or rock-drill is as follows:v`

On the out-door or effective stroke of the piston, the free end of the pendant F has a tendency, on account of its weight and consequent inertia, to remain motionless; but, as the upper end ofit is carried forward by the movement of the frame G, its lower end drags behind, and swings toward the cylinder of the engine, as shown by the dotted red lines iu fig. 3.

This backward swing or vibration of the pendant, which is limited by stop f', causes the pawl L to operate the ratchet-wheel e, by which means the chisel I From the above description, it will be seen that the chisel is automatically rotated at every outward stroke of the-piston, and the amount of rotation which is imparted to the chisel ,can be regulated by the gearing G H, so as to adapt the drill to different kinds of mining-operations.

The worm G and Wheel H not o'nly rotate the drill, but they also serve to hold the latter in position, and prevent its turning in its bearing, in case the point of the chisel should come in contact with some hard substance.

It is evident that the arrangement of parts here de- It will be seen, by referring to g. 2, that all of the.

operative parts of my drilling-apparz-ttus can bev detached ina moments time, and new ones applied, in case any of them should become broken, or otherwise injured.

v In drilling very hard rocks, it may sometimes be necessary to give the chisel such a short and slow stroke that the momentum kwould not be sucient to operate the swinging pendant, in which case a positive movement should -be imparted toit by 'connecting its lower end to one end of a rod, which could be attached to the engine, or other fixed object, as shown by dotted red lines in fig. l.

Before making this connection with the engine, the

ratchet-wheel e should be reversed, in order that the pawl L` may operate said pendant on the in-door insteadfof the out-door stroke of the piston, so as `to prevent the rotation of the chisel while it is in `contact with the rock.

Mechanical equivalents of the devices for rotating the chisel may manifestly be substituted for them, without changingA the invention.

I claim herein as new, and of my inventionlLf'lhe chisel I of a drilling-machine, rotated by means of the vibrating pendant F, ratchet-arrangement Le, worm G, and Worm-wheel H, substantially as 'set forth.

-2. .The combination, substantially as describedfof the piston B b, key D, frame ,C c, worm-wheel H h, chisel I i i', socket J, and lkey K, for the purposefof permitting the ready attachment and detachment of the various parts'of the device, as herein specified.

In testimony of which invention, I hereunto set my hand. 1 Witnesses: RICHARD C. M.' LOVELL.

Gmo. H. KNIGHT, JAMES H. LAYMAN. 

